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Loan and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Non-Covered Past Due and Nonaccrual Loans and Loans Past Due by Class of Loans (Detail) (Non-Covered Loans [Member], USD $)
Mar. 31, 2013
Dec. 31, 2012
Commercial and Industrial [Member]
    
30-59 Days Past Due $ 1,893,000 $ 233,000
60-89 Days Past Due 133,000 457,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 2,026,000 690,000
Nonaccrual 3,387,000 3,136,000
Current 527,528,000 543,596,000
Total Loans and Financing Receivables 532,941,000 547,422,000
Construction - speculative [Member]
    
90+ Days Past Due and Accruing      
Nonaccrual 10,620,000 10,663,000
Current 25,007,000 27,231,000
Total Loans and Financing Receivables 35,627,000 37,894,000
Construction - non-speculative [Member]
    
90+ Days Past Due and Accruing      
Current 20,076,000 21,827,000
Total Loans and Financing Receivables 20,076,000 21,827,000
Commercial real estate - owner occupied [Member]
    
30-59 Days Past Due 945,000  
90+ Days Past Due and Accruing      
Total Past Due and Accruing 945,000  
Nonaccrual 1,658,000 5,415,000
Current 688,544,000 698,552,000
Total Loans and Financing Receivables 691,147,000 703,967,000
Commercial real estate - non-owner occupied [Member]
    
30-59 Days Past Due 875,000  
90+ Days Past Due and Accruing      
Total Past Due and Accruing 875,000  
Nonaccrual 18,306,000 15,624,000
Current 1,285,870,000 1,270,516,000
Total Loans and Financing Receivables 1,305,051,000 1,286,140,000
Residential real estate (SFR 1-4) [Member]
    
30-59 Days Past Due 824,000 107,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 824,000 107,000
Nonaccrual 11,561,000 13,102,000
Current 149,637,000 146,079,000
Total Loans and Financing Receivables 162,022,000 159,288,000
Dairy and livestock [Member]
    
90+ Days Past Due and Accruing      
Nonaccrual 9,371,000 9,842,000
Current 269,131,000 317,737,000
Total Loans and Financing Receivables 278,502,000 327,579,000
Agribusiness [Member]
    
90+ Days Past Due and Accruing      
Current 5,370,000 9,081,000
Total Loans and Financing Receivables 5,370,000 9,081,000
Municipal Lease Finance Receivables [Member]
    
90+ Days Past Due and Accruing      
Current 109,727,000 105,767,000
Total Loans and Financing Receivables 109,727,000 105,767,000
Consumer [Member]
    
30-59 Days Past Due 63,000 74,000
60-89 Days Past Due   8,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 63,000 82,000
Nonaccrual 161,000 215,000
Current 43,892,000 47,260,000
Total Loans and Financing Receivables 44,116,000 47,557,000
Auto and equipment leases [Member]
    
30-59 Days Past Due   8,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing   8,000
Nonaccrual 65,000  
Current 12,357,000 12,708,000
Total Loans and Financing Receivables 12,422,000 12,716,000
Total non-covered gross loans [Member]
    
30-59 Days Past Due 4,600,000 422,000
60-89 Days Past Due 133,000 465,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 4,733,000 887,000
Nonaccrual 55,129,000 57,997,000
Current 3,137,139,000 3,200,354,000
Total Loans and Financing Receivables $ 3,197,001,000 $ 3,259,238,000